google-visualization interview questions
Top google-visualization frequently asked interview questions
Is there a way to plot a chart with Google chart API so that the X-axis values are days in a month?
I have data points that are not provided with the same frequency. For example:
Date - Value
1/1/2009 - 100
1/5/2009 - 150
1/6/2009 - 165
1/13/2009 - 200
1/20/2009 - 350
1/30/2009 - 500
I want to make a chart that will separate each data point with the relative distance based on time during a month. This can be done with Excel, but how can I calculate and display it with Google chart?
Other free solutions similar to Google chart or a free library that can be used with ASP.NET are also welcome.
Source: (StackOverflow)
I am generating this Google Line Chart using the Google JS API. As you can see, the labels are very narrow. How do I make it so that the whole label text is visible?
Source: (StackOverflow)
I have this Column Chart using Google's Visualization Chart API tools. How would I make it so the y-axis numbers are only positive whole numbers? I've tried looking through the documentation but can't seem to find anything.
Source: (StackOverflow)
I have searched a lot to find a good example for generating a Google Chart using MySQL table data as the data source. I searched for a couple of days and realised that there are few examples available for generating a Google Chart (pie, bar, column, table) using a combination of PHP and MySQL. I finally managed to get one example working.
I have previously received a lot of help from StackOverflow, so this time I will return some.
I have two examples; one uses Ajax and the other does not. Today, I will only show the non-Ajax example.
Usage:
Requirements: PHP, Apache and MySQL
Installation:
--- Create a database by using phpMyAdmin and name it "chart"
--- Create a table by using phpMyAdmin and name it "googlechart" and make
sure table has only two columns as I have used two columns. However,
you can use more than 2 columns if you like but you have to change the
code a little bit for that
--- Specify column names as follows: "weekly_task" and "percentage"
--- Insert some data into the table
--- For the percentage column only use a number
---------------------------------
example data: Table (googlechart)
---------------------------------
weekly_task percentage
----------- ----------
Sleep 30
Watching Movie 10
job 40
Exercise 20
PHP-MySQL-JSON-Google Chart Example:
<?php
$con=mysql_connect("localhost","Username","Password") or die("Failed to connect with database!!!!");
mysql_select_db("Database Name", $con);
// The Chart table contains two fields: weekly_task and percentage
// This example will display a pie chart. If you need other charts such as a Bar chart, you will need to modify the code a little to make it work with bar chart and other charts
$sth = mysql_query("SELECT * FROM chart");
/*
---------------------------
example data: Table (Chart)
--------------------------
weekly_task percentage
Sleep 30
Watching Movie 40
work 44
*/
$rows = array();
//flag is not needed
$flag = true;
$table = array();
$table['cols'] = array(
// Labels for your chart, these represent the column titles
// Note that one column is in "string" format and another one is in "number" format as pie chart only required "numbers" for calculating percentage and string will be used for column title
array('label' => 'Weekly Task', 'type' => 'string'),
array('label' => 'Percentage', 'type' => 'number')
);
$rows = array();
while($r = mysql_fetch_assoc($sth)) {
$temp = array();
// the following line will be used to slice the Pie chart
$temp[] = array('v' => (string) $r['Weekly_task']);
// Values of each slice
$temp[] = array('v' => (int) $r['percentage']);
$rows[] = array('c' => $temp);
}
$table['rows'] = $rows;
$jsonTable = json_encode($table);
//echo $jsonTable;
?>
<html>
<head>
<!--Load the Ajax API-->
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript">
// Load the Visualization API and the piechart package.
google.load('visualization', '1', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.setOnLoadCallback(drawChart);
function drawChart() {
// Create our data table out of JSON data loaded from server.
var data = new google.visualization.DataTable(<?=$jsonTable?>);
var options = {
title: 'My Weekly Plan',
is3D: 'true',
width: 800,
height: 600
};
// Instantiate and draw our chart, passing in some options.
// Do not forget to check your div ID
var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<!--this is the div that will hold the pie chart-->
<div id="chart_div"></div>
</body>
</html>
PHP-PDO-JSON-MySQL-Google Chart Example:
<?php
/*
Script : PHP-PDO-JSON-mysql-googlechart
Author : Enam Hossain
version : 1.0
*/
/*
--------------------------------------------------------------------
Usage:
--------------------------------------------------------------------
Requirements: PHP, Apache and MySQL
Installation:
--- Create a database by using phpMyAdmin and name it "chart"
--- Create a table by using phpMyAdmin and name it "googlechart" and make sure table has only two columns as I have used two columns. However, you can use more than 2 columns if you like but you have to change the code a little bit for that
--- Specify column names as follows: "weekly_task" and "percentage"
--- Insert some data into the table
--- For the percentage column only use a number
---------------------------------
example data: Table (googlechart)
---------------------------------
weekly_task percentage
----------- ----------
Sleep 30
Watching Movie 10
job 40
Exercise 20
*/
/* Your Database Name */
$dbname = 'chart';
/* Your Database User Name and Passowrd */
$username = 'root';
$password = '123456';
try {
/* Establish the database connection */
$conn = new PDO("mysql:host=localhost;dbname=$dbname", $username, $password);
$conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
/* select all the weekly tasks from the table googlechart */
$result = $conn->query('SELECT * FROM googlechart');
/*
---------------------------
example data: Table (googlechart)
--------------------------
weekly_task percentage
Sleep 30
Watching Movie 10
job 40
Exercise 20
*/
$rows = array();
$table = array();
$table['cols'] = array(
// Labels for your chart, these represent the column titles.
/*
note that one column is in "string" format and another one is in "number" format
as pie chart only required "numbers" for calculating percentage
and string will be used for Slice title
*/
array('label' => 'Weekly Task', 'type' => 'string'),
array('label' => 'Percentage', 'type' => 'number')
);
/* Extract the information from $result */
foreach($result as $r) {
$temp = array();
// the following line will be used to slice the Pie chart
$temp[] = array('v' => (string) $r['weekly_task']);
// Values of each slice
$temp[] = array('v' => (int) $r['percentage']);
$rows[] = array('c' => $temp);
}
$table['rows'] = $rows;
// convert data into JSON format
$jsonTable = json_encode($table);
//echo $jsonTable;
} catch(PDOException $e) {
echo 'ERROR: ' . $e->getMessage();
}
?>
<html>
<head>
<!--Load the Ajax API-->
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript">
// Load the Visualization API and the piechart package.
google.load('visualization', '1', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.setOnLoadCallback(drawChart);
function drawChart() {
// Create our data table out of JSON data loaded from server.
var data = new google.visualization.DataTable(<?=$jsonTable?>);
var options = {
title: 'My Weekly Plan',
is3D: 'true',
width: 800,
height: 600
};
// Instantiate and draw our chart, passing in some options.
// Do not forget to check your div ID
var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<!--this is the div that will hold the pie chart-->
<div id="chart_div"></div>
</body>
</html>
PHP-MySQLi-JSON-Google Chart Example
<?php
/*
Script : PHP-JSON-MySQLi-GoogleChart
Author : Enam Hossain
version : 1.0
*/
/*
--------------------------------------------------------------------
Usage:
--------------------------------------------------------------------
Requirements: PHP, Apache and MySQL
Installation:
--- Create a database by using phpMyAdmin and name it "chart"
--- Create a table by using phpMyAdmin and name it "googlechart" and make sure table has only two columns as I have used two columns. However, you can use more than 2 columns if you like but you have to change the code a little bit for that
--- Specify column names as follows: "weekly_task" and "percentage"
--- Insert some data into the table
--- For the percentage column only use a number
---------------------------------
example data: Table (googlechart)
---------------------------------
weekly_task percentage
----------- ----------
Sleep 30
Watching Movie 10
job 40
Exercise 20
*/
/* Your Database Name */
$DB_NAME = 'chart';
/* Database Host */
$DB_HOST = 'localhost';
/* Your Database User Name and Passowrd */
$DB_USER = 'root';
$DB_PASS = '123456';
/* Establish the database connection */
$mysqli = new mysqli($DB_HOST, $DB_USER, $DB_PASS, $DB_NAME);
if (mysqli_connect_errno()) {
printf("Connect failed: %s\n", mysqli_connect_error());
exit();
}
/* select all the weekly tasks from the table googlechart */
$result = $mysqli->query('SELECT * FROM googlechart');
/*
---------------------------
example data: Table (googlechart)
--------------------------
Weekly_Task percentage
Sleep 30
Watching Movie 10
job 40
Exercise 20
*/
$rows = array();
$table = array();
$table['cols'] = array(
// Labels for your chart, these represent the column titles.
/*
note that one column is in "string" format and another one is in "number" format
as pie chart only required "numbers" for calculating percentage
and string will be used for Slice title
*/
array('label' => 'Weekly Task', 'type' => 'string'),
array('label' => 'Percentage', 'type' => 'number')
);
/* Extract the information from $result */
foreach($result as $r) {
$temp = array();
// The following line will be used to slice the Pie chart
$temp[] = array('v' => (string) $r['weekly_task']);
// Values of the each slice
$temp[] = array('v' => (int) $r['percentage']);
$rows[] = array('c' => $temp);
}
$table['rows'] = $rows;
// convert data into JSON format
$jsonTable = json_encode($table);
//echo $jsonTable;
?>
<html>
<head>
<!--Load the Ajax API-->
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.8.2/jquery.min.js"></script>
<script type="text/javascript">
// Load the Visualization API and the piechart package.
google.load('visualization', '1', {'packages':['corechart']});
// Set a callback to run when the Google Visualization API is loaded.
google.setOnLoadCallback(drawChart);
function drawChart() {
// Create our data table out of JSON data loaded from server.
var data = new google.visualization.DataTable(<?=$jsonTable?>);
var options = {
title: 'My Weekly Plan',
is3D: 'true',
width: 800,
height: 600
};
// Instantiate and draw our chart, passing in some options.
// Do not forget to check your div ID
var chart = new google.visualization.PieChart(document.getElementById('chart_div'));
chart.draw(data, options);
}
</script>
</head>
<body>
<!--this is the div that will hold the pie chart-->
<div id="chart_div"></div>
</body>
</html>
Source: (StackOverflow)
Well, this looks strange but I'm not able to find a solution.
Why in the world does this fiddle http://jsfiddle.net/carlesso/PKkFf/ show the page content and, then when google.load occurs, the page goes blank?
It works well if the google.load is done immediately, but having it delayed does not work at all.
Here the page source for the lazier (or smarter) of you:
<!DOCTYPE html>
<html lang="en">
<head>
<title>Ciao</title>
<script type="text/javascript" src="https://www.google.com/jsapi"></script>
</head>
<body>
<h1>Test</h1>
<div id="quicivanno">
<p>ciao</p>
</div>
</body>
<script type="text/javascript">
setTimeout(function() {google.load('visualization', '1.0', {'packages':['corechart']});}, 2000);
</script>
</html>
Source: (StackOverflow)
I want to create a pie chart in JavaScript. On searching I found the Google Charts API. Since we are using jQuery I found that there is jQuery integration for Google Charts available.
But my problem is here the actual data is sent to the Google server for creating the charts. Is there a way to prevent the data from being sent to Google? I am concerned about sending my data to a third party.
Source: (StackOverflow)
We are using google org chart API to display our org charts. This works well but we need something that supports:
- One person reporting to multiple managers
- Co heads of a functional areas.
Are there any competing tools that give better support for the above.
NOTE: For Gorka LLona, who suggested this solution below in one of the answers, i found a few bugs, here is a screenshot of the issue i am running into using your test example.
Source: (StackOverflow)
I just checked my Chromium task manager and noticed that my Goats Teleported count is abnormally high. I thought it might be a good idea to create a browser extension that runs the goat teleportation data through Google Visualizations API and generates some nice reports so I can track it easily and make sure it doesn't get out of hand.
Is it possible to access the Goats Teleported count programatically via the chrome extension API? How do you think I should format the reports? I was thinking maybe a pie chart?
Source: (StackOverflow)
I am looking for a charts library to be displayed on a website. I will use intensively this library (for area, line and bar charts mainly), so I prefer to secure my choice before starting implementing.
The list of website chart libraries that I have initially considered are:
However after some researches on this forum and investigations on the web, I have reduced my candidate list to these two libraries:
- Flot jQuery plugin
- Google Visualization
Which one do you advise me to use and why (if you have worked with one or two of them, please tell me your feedback)?
How do they compare one to each other regarding ease of use, performance and features?
Thank you
EDIT: Based-Flash Chart libraries were not eligible with my constraints
Source: (StackOverflow)
I am using Twitter's bootstrap for one of my application and want to show graphs and charts. I tried using Google charts and I have placed in the div container. However these charts aren't responsive. I want to know is there any other frameworks for displaying charts which are responsive and works with bootstrap.
Even is it possible to display responsive charts as of now?
Source: (StackOverflow)
I want to include all the provinces of Pakistan using google geochart. But only 3 are picked up. My code is setting the names of provinces in the script and then the provinces should get picked up by the library.
var data = google.visualization.arrayToDataTable([
['Province'],
['Punjab'],
['Khyber Pakhtunkhwa'],
['Islamabad Capital Territory'],
['Federally Administered Tribal Areas'],
['Northern Areas'],
['Azad Kashmir'],
['Balochi']
]);
One possibility is that I spellt the regions wrong but it doesn't seem that way.
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta charset="UTF-8">
<meta name="keywords"
content="Houses Apartments, Vacation homes, Offices, Land, Flatmates,Paying Guest, Other real estate, Cars, Motorcycles, Accessories parts, Trucks, Other vehicles, Home Garden, Clothing, For Kids (Toys Clothes), Jewelry Watches, Hobbies, Sports Bicycles, Movies, Books Magazines, Pets, Tickets, Art Collectibles, Music Instruments, Computers Accessories, TV, Audio, Video, Cameras, Cellphones gadgets, Video games consoles, Job offers, Resumes, Services, Classes, Professional,Office equipment, Other, ">
<meta name="description"
content="Find jobs, cars, houses, mobile phones and properties for sale in your region conveniently. Find the best deal among {{count}} free ads online!">
<title>Free classifieds in India - Koolbusiness.com</title>
<link rel='nofollow' href="/static/css/koolindex_in.css?0.238133053892" rel="stylesheet" type="text/css">
<script type="text/javascript" src="/static/js/jquery-1.10.2.min.js?0.238133053892"></script>
</head>
<body>
{% include "kooltopbar.html" %}
<script type='text/javascript' src='http://www.google.com/jsapi'></script>
<script type='text/javascript'>
function drawMap() {
var data = google.visualization.arrayToDataTable([
['Province'],
['Punjab'],
['Khyber Pakhtunkhwa'],
['Islamabad Capital Territory'],
['Federally Administered Tribal Areas'],
['Northern Areas'],
['Azad Kashmir'],
['Balochi']
]);
var options = {
region:'PK',
backgroundColor: '#81d4fa',
datalessRegionColor: '#ffc801',
width:468,
height:278,
resolution: 'provinces',
};
var container = document.getElementById('mapcontainer');
var chart = new google.visualization.GeoChart(container);
function myClickHandler(){
var selection = chart.getSelection();
var message = '';
for (var i = 0; i < selection.length; i++) {
var item = selection[i];
// if (item.row != null && item.column != null) {
message += '{row:' + item.row + ',column:' + item.column + '}';
//} else
if (item.row != null) {
message += '{row:' + item.row + '}';
//} else if (item.column != null) {
// message += '{column:' + item.column + '}';
}
}
if (message == '') {
message = 'nothing';
}
//alert('You selected ' + message);
if (item.row==2) {
window.location = "/andhra_pradesh/";
}
if (item.row==3) {
window.location = "/arunachal_pradesh/";
}
if (item.row==4) {
window.location = "/assam/";
}
if (item.row==6) {
window.location = "/chhattisgarh/";
}
if (item.row==7) {
window.location = "/goa/";
}
if (item.row==8) {
window.location = "/gujarat/";
}
if (item.row==9) {
window.location = "/haryana/";
}
if (item.row==10) {
window.location = "/himachal_pradesh/";
}
if (item.row==11) {
window.location = "/jammu_kashmir/";
}
if (item.row==12) {
window.location = "/jharkhand/";
}
if (item.row==13) {
window.location = "/karnataka/";
}
if (item.row==14) {
window.location = "/kerala/";
}
if (item.row==15) {
window.location = "/madhya_pradesh/";
}
if (item.row==16) {
window.location = "/maharashtra/";
}
if (item.row==17) {
window.location = "/manipur/";
}
if (item.row==18) {
window.location = "/meghalaya/";
}
if (item.row==19) {
window.location = "/mizoram/";
}
if (item.row==20) {
window.location = "/nagaland/";
}
if (item.row==21) {
window.location = "/orissa/";
}
if (item.row==22) {
window.location = "/punjab/";
}
if (item.row==23) {
window.location = "/rajasthan/";
}
if (item.row==24) {
window.location = "/sikkim/";
}
if (item.row==25) {
window.location = "/tamil_nadu/";
}
if (item.row==25) {
window.location = "/tripura/";
}
if (item.row==28) {
window.location = "/uttar_pradesh/";
}
if (item.row==29) {
window.location = "/west_bengal/";
}
if (item.row==36) {
window.location = "/andaman_nicobar_islands/";
}
}
google.visualization.events.addListener(chart, 'select', myClickHandler);
chart.draw(data, options);
}
google.load('visualization', '1', {packages: ['geochart'], callback: drawMap});
</script>
<div id="wrapper">
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your region or in all Pakistan.
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</div>
<div id="regions">
<div class="region_links_one">
<ul class="regions_one">
<li><a id="region_8" class="region" rel='nofollow' href="http://www.koolbusiness.com/andhra_pradesh/">Andhra
Pradesh</a></li>
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Pradesh</a></li>
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</li>
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<li><a id="region_16" class="region" rel='nofollow' href="http://www.koolbusiness.com/himachal_pradesh/">Himachal
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</li>
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</li>
<li><a id="region_21" class="region" rel='nofollow' href="http://www.koolbusiness.com/madhya_pradesh/">Madhya
Pradesh</a></li>
</ul>
<ul class="regions_two">
<li><a id="region_22" class="region"
rel='nofollow' href="http://www.koolbusiness.com/maharashtra/">Maharashtra</a></li>
<li><a id="region_23" class="region" rel='nofollow' href="http://www.koolbusiness.com/manipur/">Manipur</a>
</li>
<li><a id="region_24" class="region" rel='nofollow' href="http://www.koolbusiness.com/meghalaya/">Meghalaya</a>
</li>
<li><a id="region_25" class="region" rel='nofollow' href="http://www.koolbusiness.com/mizoram/">Mizoram</a>
</li>
<li><a id="region_26" class="region" rel='nofollow' href="http://www.koolbusiness.com/nagaland/">Nagaland</a>
</li>
<li><a id="region_27" class="region" rel='nofollow' href="http://www.koolbusiness.com/orissa/">Orissa</a>
</li>
<li><a id="region_28" class="region" rel='nofollow' href="http://www.koolbusiness.com/punjab/">Punjab</a>
</li>
<li><a id="region_29" class="region" rel='nofollow' href="http://www.koolbusiness.com/rajasthan/">Rajasthan</a>
</li>
<li><a id="region_30" class="region" rel='nofollow' href="http://www.koolbusiness.com/sikkim/">Sikkim</a>
</li>
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Source: (StackOverflow)
I'm trying to build a Google Chart to show some uptime and downtime percentages, stacked. This works great except for one small thing - I'd like the baseline of the chart to be at 99.8, and the maximum to be 100 - since downtimes are usually less than .2, this will make the chart readable.
This seemed simple enough to me. I figured this would work:
var data = new google.visualization.DataTable();
data.addColumn('string', 'Date');
data.addColumn('number', 'Uptime');
data.addColumn('number', 'Downtime');
data.addRows([
['Dec 1, 1830', 99.875, 0.125],
['Dec 8, 1830', 99.675, 0.325],
['Dec 15, 1830', 99.975, 0.025],
['Dec 22, 1830', 100.0, 0.0]
]);
var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
chart.draw(data, {width: 400, height: 240, isStacked: true, vAxis: { title: "Percentage Uptime", minValue: 99.8, maxValue: 100}});
Unfortunately, the chart utterly disregards the minValue on the vAxis. This seems to be expected behaviour, according to the API, but this leaves the question - how would I accomplish this? I even went so far as to transform the data - ie, to subtract 99.8 from all the uptime values, and just have the chart go from 0 to .2, and this spits out a graph that looks okay, but I can't apply labels to the vertical axis that would say 99.8, 99.85, 99.9, whatever - the axis says, quite dutifully, 0 at the bottom, and .2 at the top, and there seems to be no way to fix it this directions, either. Either solution would be acceptable, I'm sure there's SOME way to make this work?
Source: (StackOverflow)
Is there any alternative to Google's Annotated Timeline Visualization API?
There's some bugs in the Annotated Timeline, and it doesn't appear they will be addressed.
Also it is a Flash based chart. A Canvas+Javascript implementation would be more portable.
The qualities that make the Annotated Timeline valuable (as opposed to every other charting library i've found so far) are:
- supports multiple lines
- zooming; to drill in and out of a date range
- panning back and forth through time
- supports thousands of data points
- ability to be fed new data on the fly
As far as i can tell Google's Annotated Timeline is the only interactive line graph library.
Source: (StackOverflow)
I've got several functions that instantiate various charts using Google Charts API.
When I call them without jQuery's $(document).ready method, everything works fine. But with that method, I'm looking at blank screen.
Why?
<script type="text/javascript" src = "http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.js" charset="utf-8"></script>
<script type="text/javascript" src = "http://www.google.com/jsapi" charset="utf-8"></script>
function drawColumnChart1(){..some code..}
function drawColumnChart2(){..some code..}
function drawGeoChart(){.some code..}
//This works fine.
google.load("visualization", "1", {packages:["piechart", "corechart", "geomap"]});
google.setOnLoadCallback(window.drawColumnChart1);
google.setOnLoadCallback(window.drawColumnChart2);
google.setOnLoadCallback(window.drawGeoChart);
//This doesn't work
$(document).ready(function(){
google.load("visualization", "1", {packages:["piechart", "corechart", "geomap"]});
google.setOnLoadCallback(window.drawColumnChart1);
google.setOnLoadCallback(window.drawColumnChart2);
google.setOnLoadCallback(window.drawGeoChart);
});
UPDATE
Here is the error I get in Firebug:
uncaught exception: [Exception... "Could not convert JavaScript argument" nsresult: "0x80570009 (NS_ERROR_XPC_BAD_CONVERT_JS)" location: "JS frame :: http://www.google.com/jsapi :: Q :: line 20" data: no]
http://www.google.com/jsapi
Line 22
Source: (StackOverflow)